Universal machine head brake



May 22, 1945. J. KlS

UNIVERSAL MACHINE HEAD BRAKE Filed Aug. 14, 1943 R m w m SEfsy'. /0

A T'TOENEV S.

Patented May 22, 1945 STATES PATENT OFFICE UuIvERsAL MACHINE HEAD BRAKE John Kis,Racine,Wis. I it Application August 14, 1943, Serial No. 498,649

' fzo'ni s. (o1. 188-77) This invention relates to improvements in universal machine head brakes. i In my prior Patent No. 1,834,716 I have shown and described a universal machine head adapted for mounting on a machine tool spindle for boring inside and outside tapers, turning outside taper hubs, turning perfect radii, undercutting or forming straight or bevel faces, etc. The machine head of my prior patent is susceptible of complicatedmovements, adjustments, and feeds and is characterized by the fact that the feed of the head is independent of the feed of the machine and the head revolves With the machine tool spindle. Rectilineal movement of, a tool-carrying sliding bar, and other feeds, are controlled by an operating lever which in my priorpatent, as well as in the present improvements, is manually manipulated to effect an engagement ordisen gagement as between a spindle driven gear in the machine head and a feed gear shaft or sleeve.

While the lever operated brake mechanism shown and described in my prior patent is effective and accomplishes its purpose it has been found that it is highly desirable to obtain cessation or progression of a feed instantaneously upon a slight touch impartedto the leveras this will the work or. from cutting beyond the desired depth. With the', above in mind it is, therefore, a general object of the present invention to provide as set forth in the claims, and all equivalents thereof. 1

In the accompanying drawing in which the same reference characters indicate the same parts in all of the views:

Fig. 1 is a perspective view of a universal machine head equipped with the improved brake;

Fig. 2 is a top view of the brake mechanism per'se with parts brokenaway and in longitudinal section;

Fig. 3 is a side view of the improved brake and adjacent portions of the parts of a universal machine head which are influenced by actuation of the brake, parts being broken away and in section and the gear enclosing casing being omitted; and

Fig. 4 is a detail transverse sectional view taken on line 4-4 of Fig. 2.

Referring now more particularly to the drawing it will appear that a universal machine head is indicated generally by th numeral 8. Said universal machine head is fully illustrated and described in U. S. Patent No. 1,834,716 to John Kis, dated December 1, 1931. The present invention resides in an improved manually operated brake'mechanism, generally designated by the prevent the tool from digging in and damaging an improved brake for a universal machine head of the type covered in my prior Patent No; 1,834,716 which when manually touched or ma nipulated, will ,effect an instantaneous engage,

ment or disengagement of the machine head feed.

Afurther object of the invention is to provide a universal machine head brake which, through aneasyandi quick manipulation of the brake control lever, will regulate the extent of feed of the machine tool to a thousandth part of an inch.

A further object of the invention is to provide a universal machine head brake which is rapidly and powerfully operated through opening and closing movements imparted to spring urged twin dogs.

A further object of the invention is to provide a universal machine head brake which is very simple in construction and operation, is strong and durable, is eflicient and instantaneous in its operation, is inexpensive to manufacture, is applicable to universal machine heads now in servincludes a body extension H having a threaded numeral 9, and its association with parts of'said universal machine head which are under the control of the brake.

The universal machine head 8 is adapted to be mounted on the spindle I!) of a machine and bore 18 securely engaged by an end portion of the machine spindle Ill. The universal machine head 8 also includes a main drive gear l2 having a collar or sleeve-like tubular extension [3 which surrounds a portion of the body extension H with v an interposedbronze bushing I4.- Surrounding the sleeve extension I3 is a circular cast iron' brake body l5 whose outer surface is formed with a. V-recess IS. The brake body has a pressed fit with the sleeve extension l3, and the bushing l4,

extension l3 and brake body l5 are all connectedby akey l1.

A split V-shaped ring [9, preferably formed of steel, is lodged within the recess 16 of the brake,

body l5. Said ring, in the form of two complementary semicircular sections, has one pair of adjacent ends of the sections pivotally connected by a link 20. The other pair of ends of said ring sections are in adjacency, but are urged toward a slightly expanded or open position by a spring 2|. Outer face portions of said ends of the ring sections are formed with shouldered notches 22.

A casing 23 surrounds and encloses the ele- 'ments l3, l4, l and IS. The major portion of said casing is of circular contour but the side i thereof which encloses the notched ends of the.

ring sections is iormedas a laterally extended, tapered casing extension 23 whose extremity is cylindrical and tubular, as at 24, and has external screw threads 25 securely engaged by a coupling nut 26.

A turnable handle is indicated by the numeral 27 and the outer end of the same is knurledvfor hand engagement and operation.

the knurled portion the handle is reduced to ex tend into and through the coupling nut 26, the

bored and cylindrical casing extremity!!!,'sandv into a hollow interior portion of the casing extension 23. That portion of the handle which is Inwardly of 4 dependent of the feed of the machine on which it is mounted. As is brought out in Patent No.

7 1,834;171,ithe.;motion of a sliding bar which is within the coupling nut is formed with threads 28 engaging similar threads within said, coupling nut. The inner end of the handle -dis-" posed; within an en-largedpocliet 2.9 inj-the casing extension 23, is tapered, as at 30. I

A pai o win do 3 are intermediately ,plvotally mounted within theeasing extension and between one pair of angled end ofisaid dogs the tapered end '30 of the handle i disposed t contact.;.and actuate said dogsupon progression of the ham-lie. The other trends of .said dog which are spread, have shouldered extremities lodged within the shouldered notches 22 .:of the rin section 19. .A stop pin 31 is disposed .between-adjacent edge portions of the dogs. 'Wi'th the universal machine head mounted .on thespindlem of ama'thine and when the power is spindle in will. be constantly revolved, as will the body extension II which is connected to and .a part of the head 8. The latter, carrying the tool, is under constant. rota i lelative to work, The, improved brake. functions in the .fcillowing mann r: wh n th brake handle 21 is manually enga edandghas ibeen turn d to roject its. inner end.to. e1fe0t .a clamping action of ,the dogs 31 relative to'the split ring "r9, thebraikeis engaged. This then'rbecomes effective to "hold .the main drive gear 12 against rotation with the head 3, As; spindle 1'0 andbody extension 11 are rotating and thereby rotating the "head 8, a certaintra'in ofgears, worms "and pinions disposed about the circumference of the gear 12 are caused to rotate on their own axes and thus-become driving gears for yarious *feejd movements-ofthe vuniversal head machine UOOL'E'H as-is brought out in Patent No. 1;8 84;71-6. Included in this category are gears 33 and -'34-shown-%in Fig; 3,-and-a'ptm0n85is in mesh with thegear- 1'2. When,*liow ever, the brake handle 21 istiirned toretraet-the tapered end "30 from 'theends of the dogs 8|, the-spread ends-of thedogs can open and-move outwardly under the connected with the tool is effected through the gearing encased in the head 8. The operating I mild-l8 [is the sole mechanism which remains stationary, and by a simple turn of the operating handle'the brake mechanism becomes effective toeneagenr release the machine ieeds. Iheimproved brake mechanism malgesl.it possible to obtain the results instantaneousl wit in re y slight t uch r movement. instantaneous eon trolof thetoolis thereby obtained with-the re ult that .theitool can .be prevented .from dig ing, in and tdamaging the J-Qbor ,iriom utting in o the workiurther thanis desired,

The improved brake is, .iurthermore, of simple and novel constructi n. is easily op rated and is well adapted for thepnrnosesdescnbed,

fWhat' is claimed as theinn ntionis:

moris ng a pair of elati ly ab embers, one of said members having an annular V-shaped groove'therein a V-s'haped brake band extending into said groove and having; a split, spring nrged portion to render it expansile and contractile, a housingenclosing the "brake l fi ip i mounted within said housingand engaging the split portion of the brake band-to control expansion and contraction t-hereof, and adiandle turnably connected withsaidhousing and engaging'said'dogs to-pivot the-same upon -projection and retraction of the adjacent end of 'the handle. 2. A brake mechamsm, "comprising a pair of relatively movable members, one of said members having an annular g roove therein, a "hrake hand extending into said groove and having a -resiiien til y connected portion to :render'the band expansile and contractile, a housing enclosing :the brake' band, -dogs pivotaliy mounted said housing and engag'ing the resiliently'connected portion of the-brake hand-to control expansion and contraction *thereof, anda handle turnably connected with -said hous'in-g and engaging :said dogs'to pivot the same upon proJection-and retraction of -the adjacent endof the'handle. 

